Process of purifying raw-sugar-containing juice.



JOSEF CARNIOL, OF VIENNL, AIiSTRlfA-I-IUNGARY.

PROCESS OF PURIFYING RAW- SUGAR-CONTAINING JUICE.

No Drawing.

Specification of Letters Patent.

Patented May 5, 1914.

Application filed May is, 1913. Selia1I Io.7G8,427.

T 0 all whom it may concern 5 Be it known that I J osnr CARNIOLLELsubject ofthe Emperor of Austriadlungary, and resident of the city ofVienna, AUStIliF Hungary, have invented certain new and usefulImprovements in Processes of Purifying Raw Sugar Containing which thefollowing is a full, exact description.

Juice, of glear, and

This invention relates to improvements ,in the purification of the uiceof beets, sugar cane, corn or like vegetables from which sugar may beobtained, and the object isto provide means for producing a purerprodwhicheifects an economy in the purifying lime, as -well as slaked orquick lime, is

' lime stone mixed with the juice, the compound being stirred duringmixing. After saturation,

the surplus lim'e and the added carbonate of.

lime are separated from the juice by filtration.

The process forming the subject ofthe present invention aims to producea more complete purification of the juice, and at the same time asavingof lime, by adding powdered lime stone to the diffusion, so that aprecipitation of the impurities takes place by the formation ofinsoluble calcium salts, thus saving precipitation in alater stage andproducing a product of higher nutritious value.

When purifying the juice of sugar beets, it is preferred to add thecarbonate of lime to the slices of beet on the conveyor or to distributethe ca rbonatc evenly among the slices in the diffusion. The quantity of')o\\'dcred to be added depends upon the acidity of the juice. butshould not' be sulficiont to entirely neutralize th/is acidity, so thatthe juice remains slightly acid. -At'ter this milkol' lime of added tothe juice separated from the-pulp, and renders the juice slightlyalkaline. about 0.2% to 0.25% being usually ample for this purpose. Thejuice is now heated to a temsullicient quantity i is porature of about7( Celsius, and has thoroughly mixed into it powdered lime stoneand'lime, either in a dry slatoor as milk of lime or saccharatc of lime.'lhe quantity of carbonate oi. lime must be sufii'cient to give theslime the desired strength and make misy filtration possible, whereasthequantity of lime is regulated (according to results of titration of theseparated unsaturated juice made at regular intervals so as to give themolasses ai'ualkalinity of about 0.3%.

Wheredry separation is introduced or for some reason. cold preseparationis not de siralole, the full quantity of'lime for a 0.3% alkalinity andalso the powdered lime stone can be injected into the juice at the sametime. If only an inferior product is required, the quantities of limestone and lime excess of 0.3%.

The separated juiceis saturated to the dcsiied degree of alkalinity, andafter having been slightly'heated if such is necessary, it is passedover one or several discharge openings and then filtered. For afaultless filtration, it is important that discharge opencan beincreased to produce an alkalinity in ings or separators are providedbetween malaxators 'and 'saturators or between saturating apparatus andthe presses, in order to separate the coarser grains of carbonate oflime before the juice is filtered.

The above described process is technically simpler than theusual-methods, involves less work at the filter station, and'enables anincrease in the rate of-production combined with a saving in thepurifying materials used. 0

Having thus described my invention, what I claim is A process ofpurifying raw sugar containing juice, which consists in adding powderedlime stone to the sliced juice containing material, heating the juiceobtained. to about (0% Celsius, in ecting powdered lime stone andsufiicient lime/to produce an alkalinity of approximately 0.3% insaturation, and

removing surplus lime andv lime stone by filtration.

.Tn 'witnesswhereof, I have hereunto set -1ny hand in thep'resence oftwoWitnesses.

. JOSEF CARNIOL. Witnesses:

GR'AN Eo KARL, A GUST F UGGER.

